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- N J Cerf, S Iblisdir, G Van Assche
- 2001

The cloning of quantum variables with continuous spectra is investigated. We define a Gaussian 1-to-2 cloning machine, which copies equally well two conjugate variables such as position and momentum or the two quadrature components of a light mode. The resulting cloning fidelity for coherent states, namely F = 2/3, is shown to be optimal. An asymmetric… (More)

A transformation achieving the optimal symmetric N-->M cloning of coherent states is presented. Its implementation requires only a phase-insensitive linear amplifier and a network of beam splitters. An experimental demonstration of this continuous-variable cloner should therefore be in the scope of current technology. The link between optimal quantum… (More)

- S Iblisdir, D Pérez-García, M Aguado, J Pachos
- 2008

A study of the thermal properties of two-dimensional topological lattice models is presented. This work is relevant to assess the usefulness of these systems as a quantum memory. For our purposes, we use the topo-logical mutual information Itopo as a " topological order parameter ". For Abelian models, we show how Itopo depends on the thermal topological… (More)

- N J Cerf, J Fiur´ašek, S Iblisdir, And S Massar
- 2002

A recursive method for producing path-entangled states of light is presented. These states may find applications in quantum lithography and high-precision interfer-ometric measurements. The required resources are single-photon sources, linear optics components, and photodetectors. Adding a quantum memory greatly enhances the yield in comparison with the… (More)

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